$D0B4/53428/SCPU+68: Optimization Mode Flags
+----------+---------------------------------------------------+
| Bits 7+6 | 00 = GEOS Optimization Enabled | |
| | 01 = VIC Bank 01 Optimization Enabled |
| | 10 = BASIC Optimization Enabled |
| | 11 = No Optimization |
+----------+---------------------------------------------------+
This register is read only with hardware registers disabled,
Read/Write with hardware registers enabled.